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|
{-
Copyright (C) 2006-8 John MacFarlane <jgm@berkeley.edu>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
-}
{- |
Module : Text.Pandoc.Readers.LaTeX
Copyright : Copyright (C) 2006-8 John MacFarlane
License : GNU GPL, version 2 or above
Maintainer : John MacFarlane <jgm@berkeley.edu>
Stability : alpha
Portability : portable
Conversion of LaTeX to 'Pandoc' document.
-}
module Text.Pandoc.Readers.LaTeX (
readLaTeX,
rawLaTeXInline,
rawLaTeXEnvironment'
) where
import Text.ParserCombinators.Parsec
import Text.Pandoc.Definition
import Text.Pandoc.Shared
import Data.Maybe ( fromMaybe )
import Data.Char ( chr )
import Data.List ( isPrefixOf, isSuffixOf )
-- | Parse LaTeX from string and return 'Pandoc' document.
readLaTeX :: ParserState -- ^ Parser state, including options for parser
-> String -- ^ String to parse
-> Pandoc
readLaTeX = readWith parseLaTeX
-- characters with special meaning
specialChars :: [Char]
specialChars = "\\`$%^&_~#{}\n \t|<>'\"-"
--
-- utility functions
--
-- | Returns text between brackets and its matching pair.
bracketedText :: Char -> Char -> GenParser Char st [Char]
bracketedText openB closeB = do
result <- charsInBalanced' openB closeB
return $ [openB] ++ result ++ [closeB]
-- | Returns an option or argument of a LaTeX command.
optOrArg :: GenParser Char st [Char]
optOrArg = bracketedText '{' '}' <|> bracketedText '[' ']'
-- | True if the string begins with '{'.
isArg :: [Char] -> Bool
isArg ('{':_) = True
isArg _ = False
-- | Returns list of options and arguments of a LaTeX command.
commandArgs :: GenParser Char st [[Char]]
commandArgs = many optOrArg
-- | Parses LaTeX command, returns (name, star, list of options or arguments).
command :: GenParser Char st ([Char], [Char], [[Char]])
command = do
char '\\'
name <- many1 letter
star <- option "" (string "*") -- some commands have starred versions
args <- commandArgs
return (name, star, args)
begin :: [Char] -> GenParser Char st [Char]
begin name = try $ do
string $ "\\begin{" ++ name ++ "}"
optional commandArgs
spaces
return name
end :: [Char] -> GenParser Char st [Char]
end name = try $ do
string $ "\\end{" ++ name ++ "}"
return name
-- | Returns a list of block elements containing the contents of an
-- environment.
environment :: [Char] -> GenParser Char ParserState [Block]
environment name = try $ begin name >> spaces >> manyTill block (end name) >>~ spaces
anyEnvironment :: GenParser Char ParserState Block
anyEnvironment = try $ do
string "\\begin{"
name <- many letter
star <- option "" (string "*") -- some environments have starred variants
char '}'
optional commandArgs
spaces
contents <- manyTill block (end (name ++ star))
spaces
return $ BlockQuote contents
--
-- parsing documents
--
-- | Process LaTeX preamble, extracting metadata.
processLaTeXPreamble :: GenParser Char ParserState ()
processLaTeXPreamble = try $ manyTill
(choice [bibliographic, comment, unknownCommand, nullBlock])
(try (string "\\begin{document}")) >>
spaces
-- | Parse LaTeX and return 'Pandoc'.
parseLaTeX :: GenParser Char ParserState Pandoc
parseLaTeX = do
optional processLaTeXPreamble -- preamble might not be present (fragment)
spaces
blocks <- parseBlocks
spaces
optional $ try (string "\\end{document}" >> many anyChar)
-- might not be present (fragment)
spaces
eof
state <- getState
let blocks' = filter (/= Null) blocks
let title' = stateTitle state
let authors' = stateAuthors state
let date' = stateDate state
return $ Pandoc (Meta title' authors' date') blocks'
--
-- parsing blocks
--
parseBlocks :: GenParser Char ParserState [Block]
parseBlocks = spaces >> many block
block :: GenParser Char ParserState Block
block = choice [ hrule
, codeBlock
, header
, list
, blockQuote
, comment
, bibliographic
, para
, itemBlock
, unknownEnvironment
, ignore
, unknownCommand ] <?> "block"
--
-- header blocks
--
header :: GenParser Char ParserState Block
header = try $ do
char '\\'
subs <- many (try (string "sub"))
string "section"
optional (char '*')
char '{'
title' <- manyTill inline (char '}')
spaces
return $ Header (length subs + 1) (normalizeSpaces title')
--
-- hrule block
--
hrule :: GenParser Char st Block
hrule = oneOfStrings [ "\\begin{center}\\rule{3in}{0.4pt}\\end{center}\n\n",
"\\newpage" ] >> spaces >> return HorizontalRule
--
-- code blocks
--
codeBlock :: GenParser Char ParserState Block
codeBlock = codeBlockWith "verbatim" <|> codeBlockWith "Verbatim" <|> lhsCodeBlock
-- Note: Verbatim is from fancyvrb.
codeBlockWith :: String -> GenParser Char st Block
codeBlockWith env = try $ do
string ("\\begin{" ++ env ++ "}") -- don't use begin function because it
-- gobbles whitespace
optional blanklines -- we want to gobble blank lines, but not
-- leading space
contents <- manyTill anyChar (try (string $ "\\end{" ++ env ++ "}"))
spaces
let classes = if env == "code" then ["haskell"] else []
return $ CodeBlock ("",classes,[]) (stripTrailingNewlines contents)
lhsCodeBlock :: GenParser Char ParserState Block
lhsCodeBlock = do
failUnlessLHS
(CodeBlock (_,_,_) cont) <- codeBlockWith "code"
return $ CodeBlock ("", ["sourceCode","haskell"], []) cont
--
-- block quotes
--
blockQuote :: GenParser Char ParserState Block
blockQuote = (environment "quote" <|> environment "quotation") >>~ spaces >>=
return . BlockQuote
--
-- list blocks
--
list :: GenParser Char ParserState Block
list = bulletList <|> orderedList <|> definitionList <?> "list"
listItem :: GenParser Char ParserState ([Inline], [Block])
listItem = try $ do
("item", _, args) <- command
spaces
state <- getState
let oldParserContext = stateParserContext state
updateState (\s -> s {stateParserContext = ListItemState})
blocks <- many block
updateState (\s -> s {stateParserContext = oldParserContext})
opt <- case args of
([x]) | "[" `isPrefixOf` x && "]" `isSuffixOf` x ->
parseFromString (many inline) $ tail $ init x
_ -> return []
return (opt, blocks)
orderedList :: GenParser Char ParserState Block
orderedList = try $ do
string "\\begin{enumerate}"
(_, style, delim) <- option (1, DefaultStyle, DefaultDelim) $
try $ do failIfStrict
char '['
res <- anyOrderedListMarker
char ']'
return res
spaces
option "" $ try $ do string "\\setlength{\\itemindent}"
char '{'
manyTill anyChar (char '}')
spaces
start <- option 1 $ try $ do failIfStrict
string "\\setcounter{enum"
many1 (oneOf "iv")
string "}{"
num <- many1 digit
char '}'
spaces
return $ (read num) + 1
items <- many listItem
end "enumerate"
spaces
return $ OrderedList (start, style, delim) $ map snd items
bulletList :: GenParser Char ParserState Block
bulletList = try $ do
begin "itemize"
spaces
items <- many listItem
end "itemize"
spaces
return (BulletList $ map snd items)
definitionList :: GenParser Char ParserState Block
definitionList = try $ do
begin "description"
spaces
items <- many listItem
end "description"
spaces
return (DefinitionList items)
--
-- paragraph block
--
para :: GenParser Char ParserState Block
para = do
res <- many1 inline
spaces
return $ if null (filter (`notElem` [Str "", Space]) res)
then Null
else Para $ normalizeSpaces res
--
-- title authors date
--
bibliographic :: GenParser Char ParserState Block
bibliographic = choice [ maketitle, title, authors, date ]
maketitle :: GenParser Char st Block
maketitle = try (string "\\maketitle") >> spaces >> return Null
title :: GenParser Char ParserState Block
title = try $ do
string "\\title{"
tit <- manyTill inline (char '}')
spaces
updateState (\state -> state { stateTitle = tit })
return Null
authors :: GenParser Char ParserState Block
authors = try $ do
string "\\author{"
authors' <- manyTill anyChar (char '}')
spaces
let authors'' = map removeLeadingTrailingSpace $ lines $
substitute "\\\\" "\n" authors'
updateState (\s -> s { stateAuthors = authors'' })
return Null
date :: GenParser Char ParserState Block
date = try $ do
string "\\date{"
date' <- manyTill anyChar (char '}')
spaces
updateState (\state -> state { stateDate = date' })
return Null
--
-- item block
-- for use in unknown environments that aren't being parsed as raw latex
--
-- this forces items to be parsed in different blocks
itemBlock :: GenParser Char ParserState Block
itemBlock = try $ do
("item", _, args) <- command
state <- getState
if stateParserContext state == ListItemState
then fail "item should be handled by list block"
else if null args
then return Null
else return $ Plain [Str (stripFirstAndLast (head args))]
--
-- raw LaTeX
--
-- | Parse any LaTeX environment and return a Para block containing
-- the whole literal environment as raw TeX.
rawLaTeXEnvironment :: GenParser Char st Block
rawLaTeXEnvironment = do
contents <- rawLaTeXEnvironment'
spaces
return $ Para [TeX contents]
-- | Parse any LaTeX environment and return a string containing
-- the whole literal environment as raw TeX.
rawLaTeXEnvironment' :: GenParser Char st String
rawLaTeXEnvironment' = try $ do
string "\\begin{"
name <- many1 letter
star <- option "" (string "*") -- for starred variants
let name' = name ++ star
char '}'
args <- option [] commandArgs
let argStr = concat args
contents <- manyTill (choice [ (many1 (noneOf "\\")),
rawLaTeXEnvironment',
string "\\" ])
(end name')
return $ "\\begin{" ++ name' ++ "}" ++ argStr ++
concat contents ++ "\\end{" ++ name' ++ "}"
unknownEnvironment :: GenParser Char ParserState Block
unknownEnvironment = try $ do
state <- getState
result <- if stateParseRaw state -- check whether we should include raw TeX
then rawLaTeXEnvironment -- if so, get whole raw environment
else anyEnvironment -- otherwise just the contents
return result
-- \ignore{} is used conventionally in literate haskell for definitions
-- that are to be processed by the compiler but not printed.
ignore :: GenParser Char ParserState Block
ignore = try $ do
("ignore", _, _) <- command
spaces
return Null
unknownCommand :: GenParser Char ParserState Block
unknownCommand = try $ do
notFollowedBy' $ choice $ map end ["itemize", "enumerate", "description",
"document"]
state <- getState
if stateParserContext state == ListItemState
then notFollowedBy' $ string "\\item"
else return ()
if stateParseRaw state
then do
(name, star, args) <- command
spaces
return $ Plain [TeX ("\\" ++ name ++ star ++ concat args)]
else do -- skip unknown command, leaving arguments to be parsed
char '\\'
letter
many (letter <|> digit)
optional (try $ string "{}")
spaces
return Null
-- latex comment
comment :: GenParser Char st Block
comment = try $ char '%' >> manyTill anyChar newline >> spaces >> return Null
--
-- inline
--
inline :: GenParser Char ParserState Inline
inline = choice [ str
, endline
, whitespace
, quoted
, apostrophe
, spacer
, strong
, math
, ellipses
, emDash
, enDash
, hyphen
, emph
, strikeout
, superscript
, subscript
, ref
, lab
, code
, url
, link
, image
, footnote
, linebreak
, accentedChar
, specialChar
, rawLaTeXInline
, escapedChar
, unescapedChar
] <?> "inline"
accentedChar :: GenParser Char st Inline
accentedChar = normalAccentedChar <|> specialAccentedChar
normalAccentedChar :: GenParser Char st Inline
normalAccentedChar = try $ do
char '\\'
accent <- oneOf "'`^\"~"
character <- (try $ char '{' >> letter >>~ char '}') <|> letter
let table = fromMaybe [] $ lookup character accentTable
let result = case lookup accent table of
Just num -> chr num
Nothing -> '?'
return $ Str [result]
-- an association list of letters and association list of accents
-- and decimal character numbers.
accentTable :: [(Char, [(Char, Int)])]
accentTable =
[ ('A', [('`', 192), ('\'', 193), ('^', 194), ('~', 195), ('"', 196)]),
('E', [('`', 200), ('\'', 201), ('^', 202), ('"', 203)]),
('I', [('`', 204), ('\'', 205), ('^', 206), ('"', 207)]),
('N', [('~', 209)]),
('O', [('`', 210), ('\'', 211), ('^', 212), ('~', 213), ('"', 214)]),
('U', [('`', 217), ('\'', 218), ('^', 219), ('"', 220)]),
('a', [('`', 224), ('\'', 225), ('^', 227), ('"', 228)]),
('e', [('`', 232), ('\'', 233), ('^', 234), ('"', 235)]),
('i', [('`', 236), ('\'', 237), ('^', 238), ('"', 239)]),
('n', [('~', 241)]),
('o', [('`', 242), ('\'', 243), ('^', 244), ('~', 245), ('"', 246)]),
('u', [('`', 249), ('\'', 250), ('^', 251), ('"', 252)]) ]
specialAccentedChar :: GenParser Char st Inline
specialAccentedChar = choice [ ccedil, aring, iuml, szlig, aelig,
oslash, pound, euro, copyright, sect ]
ccedil :: GenParser Char st Inline
ccedil = try $ do
char '\\'
letter' <- oneOfStrings ["cc", "cC"]
let num = if letter' == "cc" then 231 else 199
return $ Str [chr num]
aring :: GenParser Char st Inline
aring = try $ do
char '\\'
letter' <- oneOfStrings ["aa", "AA"]
let num = if letter' == "aa" then 229 else 197
return $ Str [chr num]
iuml :: GenParser Char st Inline
iuml = try (string "\\\"") >> oneOfStrings ["\\i", "{\\i}"] >>
return (Str [chr 239])
szlig :: GenParser Char st Inline
szlig = try (string "\\ss") >> return (Str [chr 223])
oslash :: GenParser Char st Inline
oslash = try $ do
char '\\'
letter' <- choice [char 'o', char 'O']
let num = if letter' == 'o' then 248 else 216
return $ Str [chr num]
aelig :: GenParser Char st Inline
aelig = try $ do
char '\\'
letter' <- oneOfStrings ["ae", "AE"]
let num = if letter' == "ae" then 230 else 198
return $ Str [chr num]
pound :: GenParser Char st Inline
pound = try (string "\\pounds") >> return (Str [chr 163])
euro :: GenParser Char st Inline
euro = try (string "\\euro") >> return (Str [chr 8364])
copyright :: GenParser Char st Inline
copyright = try (string "\\copyright") >> return (Str [chr 169])
sect :: GenParser Char st Inline
sect = try (string "\\S") >> return (Str [chr 167])
escapedChar :: GenParser Char st Inline
escapedChar = do
result <- escaped (oneOf " $%&_#{}\n")
return $ if result == Str "\n" then Str " " else result
-- nonescaped special characters
unescapedChar :: GenParser Char st Inline
unescapedChar = oneOf "`$^&_#{}|<>" >>= return . (\c -> Str [c])
specialChar :: GenParser Char st Inline
specialChar = choice [ backslash, tilde, caret, bar, lt, gt, doubleQuote ]
backslash :: GenParser Char st Inline
backslash = try (string "\\textbackslash") >> optional (try $ string "{}") >> return (Str "\\")
tilde :: GenParser Char st Inline
tilde = try (string "\\ensuremath{\\sim}") >> return (Str "~")
caret :: GenParser Char st Inline
caret = try (string "\\^{}") >> return (Str "^")
bar :: GenParser Char st Inline
bar = try (string "\\textbar") >> optional (try $ string "{}") >> return (Str "\\")
lt :: GenParser Char st Inline
lt = try (string "\\textless") >> optional (try $ string "{}") >> return (Str "<")
gt :: GenParser Char st Inline
gt = try (string "\\textgreater") >> optional (try $ string "{}") >> return (Str ">")
doubleQuote :: GenParser Char st Inline
doubleQuote = char '"' >> return (Str "\"")
code :: GenParser Char st Inline
code = code1 <|> code2
code1 :: GenParser Char st Inline
code1 = try $ do
string "\\verb"
marker <- anyChar
result <- manyTill anyChar (char marker)
return $ Code $ removeLeadingTrailingSpace result
code2 :: GenParser Char st Inline
code2 = try $ do
string "\\texttt{"
result <- manyTill (noneOf "\\\n~$%^&{}") (char '}')
return $ Code result
emph :: GenParser Char ParserState Inline
emph = try $ oneOfStrings [ "\\emph{", "\\textit{" ] >>
manyTill inline (char '}') >>= return . Emph
strikeout :: GenParser Char ParserState Inline
strikeout = try $ string "\\sout{" >> manyTill inline (char '}') >>=
return . Strikeout
superscript :: GenParser Char ParserState Inline
superscript = try $ string "\\textsuperscript{" >>
manyTill inline (char '}') >>= return . Superscript
-- note: \textsubscript isn't a standard latex command, but we use
-- a defined version in pandoc.
subscript :: GenParser Char ParserState Inline
subscript = try $ string "\\textsubscript{" >> manyTill inline (char '}') >>=
return . Subscript
apostrophe :: GenParser Char ParserState Inline
apostrophe = char '\'' >> return Apostrophe
quoted :: GenParser Char ParserState Inline
quoted = doubleQuoted <|> singleQuoted
singleQuoted :: GenParser Char ParserState Inline
singleQuoted = enclosed singleQuoteStart singleQuoteEnd inline >>=
return . Quoted SingleQuote . normalizeSpaces
doubleQuoted :: GenParser Char ParserState Inline
doubleQuoted = enclosed doubleQuoteStart doubleQuoteEnd inline >>=
return . Quoted DoubleQuote . normalizeSpaces
singleQuoteStart :: GenParser Char st Char
singleQuoteStart = char '`'
singleQuoteEnd :: GenParser Char st ()
singleQuoteEnd = try $ char '\'' >> notFollowedBy alphaNum
doubleQuoteStart :: CharParser st String
doubleQuoteStart = string "``"
doubleQuoteEnd :: CharParser st String
doubleQuoteEnd = try $ string "''"
ellipses :: GenParser Char st Inline
ellipses = try $ string "\\ldots" >> optional (try $ string "{}") >>
return Ellipses
enDash :: GenParser Char st Inline
enDash = try (string "--") >> return EnDash
emDash :: GenParser Char st Inline
emDash = try (string "---") >> return EmDash
hyphen :: GenParser Char st Inline
hyphen = char '-' >> return (Str "-")
lab :: GenParser Char st Inline
lab = try $ do
string "\\label{"
result <- manyTill anyChar (char '}')
return $ Str $ "(" ++ result ++ ")"
ref :: GenParser Char st Inline
ref = try (string "\\ref{") >> manyTill anyChar (char '}') >>= return . Str
strong :: GenParser Char ParserState Inline
strong = try (string "\\textbf{") >> manyTill inline (char '}') >>=
return . Strong
whitespace :: GenParser Char st Inline
whitespace = many1 (oneOf "~ \t") >> return Space
-- hard line break
linebreak :: GenParser Char st Inline
linebreak = try (string "\\\\") >> return LineBreak
spacer :: GenParser Char st Inline
spacer = try (string "\\,") >> return (Str "")
str :: GenParser Char st Inline
str = many1 (noneOf specialChars) >>= return . Str
-- endline internal to paragraph
endline :: GenParser Char st Inline
endline = try $ newline >> notFollowedBy blankline >> return Space
-- math
math :: GenParser Char st Inline
math = (math3 >>= return . Math DisplayMath)
<|> (math1 >>= return . Math InlineMath)
<|> (math2 >>= return . Math InlineMath)
<|> (math4 >>= return . Math DisplayMath)
<|> (math5 >>= return . Math DisplayMath)
<|> (math6 >>= return . Math DisplayMath)
<?> "math"
math1 :: GenParser Char st String
math1 = try $ char '$' >> manyTill anyChar (char '$')
math2 :: GenParser Char st String
math2 = try $ string "\\(" >> manyTill anyChar (try $ string "\\)")
math3 :: GenParser Char st String
math3 = try $ char '$' >> math1 >>~ char '$'
math4 :: GenParser Char st String
math4 = try $ do
name <- begin "equation" <|> begin "equation*" <|> begin "displaymath" <|> begin "displaymath*"
spaces
manyTill anyChar (end name)
math5 :: GenParser Char st String
math5 = try $ (string "\\[") >> spaces >> manyTill anyChar (try $ string "\\]")
math6 :: GenParser Char st String
math6 = try $ do
name <- begin "eqnarray" <|> begin "eqnarray*"
spaces
res <- manyTill anyChar (end name)
return $ filter (/= '&') res -- remove eqnarray alignment codes
--
-- links and images
--
url :: GenParser Char ParserState Inline
url = try $ do
string "\\url"
url' <- charsInBalanced '{' '}'
return $ Link [Code url'] (url', "")
link :: GenParser Char ParserState Inline
link = try $ do
string "\\href{"
url' <- manyTill anyChar (char '}')
char '{'
label' <- manyTill inline (char '}')
return $ Link (normalizeSpaces label') (url', "")
image :: GenParser Char ParserState Inline
image = try $ do
("includegraphics", _, args) <- command
let args' = filter isArg args -- filter out options
let src = if null args' then
("", "")
else
(stripFirstAndLast (head args'), "")
return $ Image [Str "image"] src
footnote :: GenParser Char ParserState Inline
footnote = try $ do
(name, _, (contents:[])) <- command
if ((name == "footnote") || (name == "thanks"))
then string ""
else fail "not a footnote or thanks command"
let contents' = stripFirstAndLast contents
-- parse the extracted block, which may contain various block elements:
rest <- getInput
setInput $ contents'
blocks <- parseBlocks
setInput rest
return $ Note blocks
-- | Parse any LaTeX command and return it in a raw TeX inline element.
rawLaTeXInline :: GenParser Char ParserState Inline
rawLaTeXInline = try $ do
notFollowedBy' $ oneOfStrings ["\\begin", "\\end", "\\item", "\\ignore"]
state <- getState
if stateParseRaw state
then do
(name, star, args) <- command
return $ TeX ("\\" ++ name ++ star ++ concat args)
else do -- skip unknown command, leaving arguments to be parsed
char '\\'
letter
many (letter <|> digit)
optional (try $ string "{}")
return $ Str ""
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